Flashing



Feb. 1935. c 055 1,992,123

Filed March 9, 1932 Patented Feb. 19 1935 PATENT oFncE FLASHING Chester H. Hobbs, Cochituate, Mass, assignor to E. Van Noorden Company, Boston, Mass., a corporation of Massachusetts Application March 9,1932, Serial No. 597,656

1 Claim.

The invention relates to that type of flashing used at the intersections of roofs and adjacent upstandingwalls. It is at the points of these intersections where practically all leaks occur.

In common practice the roof is covered with roof ing felt and the ends of the felt turned up to bear against the face of the upstanding wall. The metal flashing is then applied to fill the angle between the roof and wall with flange bearing against both, and that part of the metal flashing bearing against the roof or felt thereon is nailed to the roof. A strip of saturated felt is then mopped on to cover the metal flange nailed to the roof, and the heads of the nails with lap onto the adjacent roofing felt. Afterward pitch or asphalt is poured over the entire roof surface and gravelled in. This makes 'a practically waterproof structurefwhen initially applied. Due, however, to extreme climatic conditions, and especially to the heat of the sun, changes will occur in the form of the metal flashing. These changes tend to break the bond or seal between the metal flashing and the saturated felt sealing strip, while the bond or seal between the saturated felt sealing strip and the roofing felt itself remains unbroken. This causes a damming of water and forces the water to go under the metal flashing. The action of the heat of the sun also tends to cause the nails to pull up and allow the flashing to become loose in which case water will flow along the shanks of the nails causing roof leaks. V

The essential object of the invention is to provide a flashing which will not be disturbed by climatic changes after the initial setting of the flashing.

The invention can best be seen and understood by reference to the drawing, in which- Figure 1 is a section of the flashing shown as initially formed.

Fig. 2 is a cross section of the flashing when initially applied at the intersection of a roof and upstanding wall, and

Fig. 3 is the same as Fig. 2 except that it shows the. completed application of the flashing to the roof and upstanding wall.

Referring to the drawing:

1 represents the roof, 2 the wall adjacent the roof and upstanding therefrom, '3 roofing felt laid over the roof with end turned up to bear against the face of the wall 2 according to common practice, and which felt assists in closing the joint between the roof and the wall. 4 is the flashing.

The flashing 4 is of sheet metal, preferably copper, and is bent to provide an upwardly extending wall strip 5, an outwardly extending roof strip 6 and an intermediate sealing strip or piece '7. The strips 5 and 6 occupy-such angular relation to one another that the upstanding strip 5 will bear snugly against the face of the upstanding 5 Wall and the outstanding strip 6 will extend onto and bear against the top of the roof. The sealing strip or piece 7, formed by a fold in the metal, connects integrally with the inner ends of the respective strips 5 and 6 and is located within the angle between these strips. It overlaps the strip 6 co-operating therewith to form a pocket 8 between it and said strip, and is bendable in the direction of said strip. V a

In the application of the flashing it is first laid snugly in the intersection of the upstanding wall and the top surface of the built up roofing felt with the strip 5 covering the upturned end of the roofing felt with bearing against the wall, and with the strip 6 covering that portion of the roofing felt applied to the roof adjacent the joint between it and said wall. The roof strip 6 is then fastened to the roof by nails 9. After the nailing is completed a strip of roofing material is mopped onto the strip 6 completely covering it within pocket 8, and mopped likewise to adjacent top surface of built up roofing felt 3. Hot pitch or asphalt 11 is then poured over the top surface of the strip 10 and immediately, before the pitch or asphalt has had time to harden and set, the sealing strip or piece '7 is turned down to bear snugly against the strip 10 of roofing material thereby making seal forming engagement therewith.

The flashing forms an absolutely watertight joint, when initially applied and sealed, and its sealing will be maintained, for the reason that any distortion or bending of the metal flashing due to climatic conditions, which change of form might tend to disturb the seal, is compensated 40 for in the sealing strip or piece '7, above the joint V and without disturbing the seal.

Having thus fully described my invention, I claim and desire to secure by Letters Patent of the United States:--- i The combination with a roof and adjacent wall upstanding therefrom, of a roofing felt laid over said roof with end upturned to bear against the face of said wall, a metal flashing comprising an upwardly extending wall strip covering the upturned end of said roofing felt with bearing against said wall, an outwardlyextending roof strip covering that portion of the roofing felt applied to the roof adjacent the joint between it and said wall, and a bendable sealing strip,

strip to the roof, astri'p of roofing material laid to have extension over said fastening means with entry into said pocket, said sealing strip being bent to bear snugly against that portion of said strip of roofing material contained within said 5 pocket.

CHESTER H. HOBBS. 

